Employees at National Oilwell Varco work on a lower blowout preventer stack (left) and lower marine riser package (right).

Employees at National Oilwell Varco work on a lower blowout preventer stack (left) and lower marine riser package (right).

Photo: Melissa Phillip, Houston Chronicle

Employees at National Oilwell Varco work on a lower blowout... Photo-4587739.61151 - San Antonio Express-News

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Equipment is housed at National Oilwell Varco's distribution center in La Porte, Texas. National Oilwell Varco's distribution business is expected to spin off in 2014 to form a company called DistributionNOW.

Equipment is housed at National Oilwell Varco's distribution center in La Porte, Texas. National Oilwell Varco's distribution business is expected to spin off in 2014 to form a company called DistributionNOW.

Equipment is housed at National Oilwell Varco's distribution... Photo-5513094.61151 - San Antonio Express-News

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Equipment is housed at National Oilwell Varco's distribution center in La Porte, Texas. National Oilwell Varco's distribution business is expected to spin off in 2014 to form a company called DistributionNOW.

Equipment is housed at National Oilwell Varco's distribution center in La Porte, Texas. National Oilwell Varco's distribution business is expected to spin off in 2014 to form a company called DistributionNOW.

Equipment is housed at National Oilwell Varco's distribution... Photo-5513096.61151 - San Antonio Express-News

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Equipment is housed at National Oilwell Varco's distribution center in La Porte, Texas. National Oilwell Varco's distribution business is expected to spin off in 2014 to form a company called DistributionNOW.

Equipment is housed at National Oilwell Varco's distribution center in La Porte, Texas. National Oilwell Varco's distribution business is expected to spin off in 2014 to form a company called DistributionNOW.

Equipment is housed at National Oilwell Varco's distribution... Photo-5513097.61151 - San Antonio Express-News